C#压缩文件

一、引入ICSharpCode.SharpZipLib

新建个帮助类 ZipHelper.cs  然后 添加 dll 引用

二、添加完dll引用之后 我们 需要添加 这几个Using引用

using ICSharpCode.SharpZipLib.Checksums; 
using ICSharpCode.SharpZipLib.Zip;
using System;
using System.IO;

三、压缩单个文件

　　　　 /// <summary>
        /// ZIP:压缩单个文件
        /// add yuangang by 2016-06-13
        /// </summary>
        /// <param name="FileToZip">需要压缩的文件（绝对路径）</param>
        /// <param name="ZipedPath">压缩后的文件路径（绝对路径）</param>
        /// <param name="ZipedFileName">压缩后的文件名称（文件名，默认 同源文件同名）</param>
        /// <param name="CompressionLevel">压缩等级（0 无 - 9 最高，默认 5）</param>
        /// <param name="BlockSize">缓存大小（每次写入文件大小，默认 2048）</param>
        /// <param name="IsEncrypt">是否加密（默认 加密）</param>
        public static void ZipFile(string FileToZip, string ZipedPath, string ZipedFileName = "", int CompressionLevel = 5, int BlockSize = 2048, bool IsEncrypt = true)
        {
            //如果文件没有找到，则报错
            if (!System.IO.File.Exists(FileToZip))
            {
                throw new System.IO.FileNotFoundException("指定要压缩的文件: " + FileToZip + " 不存在!");
            }

            //文件名称（默认同源文件名称相同）
            string ZipFileName = string.IsNullOrEmpty(ZipedFileName) ? ZipedPath + "\" + new FileInfo(FileToZip).Name.Substring(0, new FileInfo(FileToZip).Name.LastIndexOf('.')) + ".zip" : ZipedPath + "\" + ZipedFileName + ".zip";

            using (System.IO.FileStream ZipFile = System.IO.File.Create(ZipFileName))
            {
                using (ZipOutputStream ZipStream = new ZipOutputStream(ZipFile))
                {
                    using (System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip, System.IO.FileMode.Open, System.IO.FileAccess.Read))
                    {
                        string fileName = FileToZip.Substring(FileToZip.LastIndexOf("\") + 1);

                        ZipEntry ZipEntry = new ZipEntry(fileName);

                        if (IsEncrypt)
                        {
                            //压缩文件加密
                            ZipStream.Password = “123”;
                        }

                        ZipStream.PutNextEntry(ZipEntry);

                        //设置压缩级别
                        ZipStream.SetLevel(CompressionLevel);

                        //缓存大小
                        byte[] buffer = new byte[BlockSize];

                        int sizeRead = 0;

                        try
                        {
                            do
                            {
                                sizeRead = StreamToZip.Read(buffer, 0, buffer.Length);
                                ZipStream.Write(buffer, 0, sizeRead);
                            }
                            while (sizeRead > 0);
                        }
                        catch (System.Exception ex)
                        {
                            throw ex;
                        }

                        StreamToZip.Close();
                    }

                    ZipStream.Finish();
                    ZipStream.Close();
                }

                ZipFile.Close();
            }
        }

四、压缩文件夹

　　　　 /// <summary>
        /// ZIP压缩文件夹
        /// </summary>
        /// <param name="DirectoryToZip">需要压缩的文件夹（绝对路径）</param>
        /// <param name="ZipedPath">压缩后的文件路径（绝对路径）</param>
        /// <param name="ZipedFileName">压缩后的文件名称（文件名，默认 同源文件夹同名）</param>
        /// <param name="Encrypt">是否加密（默认 不加密）</param>
        public static void ZipDirectory(string DirectoryToZip, string ZipedPath, string ZipedFileName = "", string Encrypt = "")
        {
            //如果目录不存在，则报错
            if (!Directory.Exists(DirectoryToZip))
            {
                throw new FileNotFoundException("指定的目录: " + DirectoryToZip + " 不存在!");
            }

            //文件名称（默认同源文件名称相同）
            string ZipFileName = string.IsNullOrEmpty(ZipedFileName) ? ZipedPath + "\" + new DirectoryInfo(DirectoryToZip).Name + ".zip" : ZipedPath + "\" + ZipedFileName + ".zip";

            using (System.IO.FileStream ZipFile = System.IO.File.Create(ZipFileName))
            {
                using (ZipOutputStream s = new ZipOutputStream(ZipFile))
                {
                    if (!string.IsNullOrEmpty(Encrypt)) s.Password = Encrypt;
                    ZipSetp(DirectoryToZip, s, "");
                }
            }
        }
        /// <summary>
        /// 递归遍历目录
        /// </summary>
        private static void ZipSetp(string strDirectory, ZipOutputStream s, string parentPath)
        {
            if (strDirectory[strDirectory.Length - 1] != Path.DirectorySeparatorChar)
            {
                strDirectory += Path.DirectorySeparatorChar;
            }
            Crc32 crc = new Crc32();

            string[] filenames = Directory.GetFileSystemEntries(strDirectory);

            foreach (string file in filenames)// 遍历所有的文件和目录
            {

                if (Directory.Exists(file))// 先当作目录处理，如果存在这个目录就递归Copy该目录下面的文件
                {
                    string pPath = parentPath;
                    pPath += file.Substring(file.LastIndexOf("\") + 1);
                    pPath += "\";
                    ZipSetp(file, s, pPath);
                }

                else // 否则直接压缩文件
                {
                    //打开压缩文件
                    using (FileStream fs = File.OpenRead(file))
                    {

                        byte[] buffer = new byte[fs.Length];
                        fs.Read(buffer, 0, buffer.Length);

                        string fileName = parentPath + file.Substring(file.LastIndexOf("\") + 1);
                        ZipEntry entry = new ZipEntry(fileName);

                        entry.DateTime = DateTime.Now;
                        entry.Size = fs.Length;

                        fs.Close();

                        crc.Reset();
                        crc.Update(buffer);

                        entry.Crc = crc.Value;
                        s.PutNextEntry(entry);

                        s.Write(buffer, 0, buffer.Length);
                    }
                }
            }
        }

五、解压一个ZIP文件

　　　　 /// <summary>
        /// ZIP:解压一个zip文件
        /// add yuangang by 2016-06-13
        /// </summary>
        /// <param name="ZipFile">需要解压的Zip文件（绝对路径）</param>
        /// <param name="TargetDirectory">解压到的目录</param>
        /// <param name="Password">解压密码</param>
        /// <param name="OverWrite">是否覆盖已存在的文件</param>
        public static void UnZip(string ZipFile, string TargetDirectory, string Password, bool OverWrite = true)
        {
            //如果解压到的目录不存在，则报错
            if (!System.IO.Directory.Exists(TargetDirectory))
            {
                throw new System.IO.FileNotFoundException("指定的目录: " + TargetDirectory + " 不存在!");
            }
            //目录结尾
            if (!TargetDirectory.EndsWith("\")) { TargetDirectory = TargetDirectory + "\"; }

            using (ZipInputStream zipfiles = new ZipInputStream(File.OpenRead(ZipFile)))
            {
                zipfiles.Password = Password;
                ZipEntry theEntry;

                while ((theEntry = zipfiles.GetNextEntry()) != null)
                {
                    string directoryName = "";
                    string pathToZip = "";
                    pathToZip = theEntry.Name;

                    if (pathToZip != "")
                        directoryName = Path.GetDirectoryName(pathToZip) + "\";

                    string fileName = Path.GetFileName(pathToZip);

                    Directory.CreateDirectory(TargetDirectory + directoryName);

                    if (fileName != "")
                    {
                        if ((File.Exists(TargetDirectory + directoryName + fileName) && OverWrite) || (!File.Exists(TargetDirectory + directoryName + fileName)))
                        {
                            using (FileStream streamWriter = File.Create(TargetDirectory + directoryName + fileName))
                            {
                                int size = 2048;
                                byte[] data = new byte[2048];
                                while (true)
                                {
                                    size = zipfiles.Read(data, 0, data.Length);

                                    if (size > 0)
                                        streamWriter.Write(data, 0, size);
                                    else
                                        break;
                                }
                                streamWriter.Close();
                            }
                        }
                    }
                }

                zipfiles.Close();
            }
        }